I have a 95 4runner with a 3.0 3VZ-E v6 engine. The motor that was in it had 200,000 on it and was wore out. I bought a rebuilt long block and installed, it started blowing oil back out thru the intake. You could take the air cleaner hose off, open the throttle body and oil would run out. I got another motor under warrenty and put in, had the same problem. Have removed the converter, checked vacum to make sure it was not a back pressure problem, checked the pcv and replaced it twice, it also has a good vacum. Checked to make sure it was timed right. Finally got the man to replace the long block again and still have oil coming out of intake. This is the third long block and it is hard to believe all 3 are bad but I can't think of any other reasons.warrenty and put in, had the same problem. Have removed the converter, checked vacum to make sure it was not a back pressure problem, checked the pcv and replaced it twice, it also has a good vacum. Checked to make sure it was timed right. During all of this the radiator, oil pump, temp & oil sending units & timing belt have been replaced.
The correct position of the pcv valve and line should be going into the manifold on the downstream side of the throttle body. There are two lines, one on the upstream side of the throttle body for the pcv system, and one with the pcv valve on the downstream side. You may have them backwards.
Finally found a pic of the pvc system, mine is hooked up right, I also had noticed that the hose between the pcv and intake was dry, no oil going thru that way. The pvc system is working like it is supposed to. I just wonder if they used bad head gasket or if there is a way to install them wrong.
No oil? You might want to try to disconnect the line at the manifold and see if you have air blowing out of the hose when the engine is running. If it does not then you may be installing the valve wrong, or may have a gasket problem, or the long block is not a match for the heads, or something is clogged in the outflow side of the head. In this process have you had any work done to the heads? Because it sounds like the oil is being fed backwards through the line that is upstream of the throttle body. Just a guess. And if the air is flowing the right way maybe the line internal in the manifold is cracked and oil is not being routed back the the heads. Checking for air flow might give you an idea of what is going on.
No oil? You might want to try to disconnect the line at the manifold and see if you have air blowing out of the hose when the engine is running. If it does not then you may be installing the valve wrong, or may have a gasket problem, or the long block is not a match for the heads, or something is clogged in the outflow side of the head. In this process have you had any work done to the heads? Because it sounds like the oil is being fed backwards through the line that is upstream of the throttle body. Just a guess. And if the air is flowing the right way maybe the line internal in the manifold is cracked and oil is not being routed back the the heads. Checking for air flow might give you an idea of what is going on.
I have replaced the PVC twice, and have made sure there is vacumm to it and in the right place. I have been very careful to check this system and there is no traces of oil in the pipe for the PVC or in the pipe from the intake hose to Valve cover. This oil has to be coming up thru the heads and into the intake. The motor comes to me as a long block so I have no way of knowing about the head gasket or heads. Another thing I have noticed is that the water does not seem to circulate as much as I've seen in others. It has a new radiator, water pump and I have replaced trhe thermostat each time I change out the motor. I'am not familar enough with this engione to know if this could be caused by the head gaskets or not. The customer is ready to take the company ther motors are coming from to court and I want to be sure that this is not something I did.
Did you pull the pcv line with engine running to see if you have air blowing out of the line from the engine side?
air is not supposed to blow out of the pvc unless you have a lot of blowby. The pvc is a spring loaded valve and takes above 18lbs of pressure to force the ball up. You can suck on the hose going to the pvc to make sure it opens which mine does.
I'm sorry I ment at the bottom of the valve with it disconnected you should have suction from the manifold pulling the pcv valve open, and you may have to rev the engine to feel it.
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